Casefile True Crime is an episodic narrative documentary show, not an interview or panel format: a narrator walks through a single case using investigative reconstruction, case documents, and archival detail rather than in-studio conversation. Numbered cases are frequently split into two to four parts, allowing extended treatment of complex investigations such as the BTK serial killer's letters or the Folbig children infant deaths in Australia. Alongside the numbered cases, the show produces 'Casefile Presents' spin-off series that dedicate a full run of episodes to one missing-persons or cold-case story, including Mattie, about Matthew Leveson's 2007 disappearance in Sydney, and Searching for Sarah MacDiarmid, about a 1990 disappearance from a Melbourne train station. These spin-offs are narrated by guest hosts rather than the main show's narrator, including Australian true crime author Vicki Petraitis and Missing Persons Advocacy Network founder Lauren O'Keefe. Interview material comes from people close to the cases, such as Matthew Leveson's parents Mark and Faye, and Sarah MacDiarmid's mother Sheila. Recurring subject matter includes serial killers, Australian cold cases, long-term missing-persons investigations, and family relationships strained by suspicion or grief. The show explicitly flags sensitive content, such as warning listeners before material involving crimes against children. Production is long-form (episodes commonly run 40 to 90-plus minutes) and case-driven rather than news-cycle driven, with archival re-releases marking the show's 10th year in 2026. Listeners drawn to detailed, multi-episode case reconstruction rather than short-form or comedic true crime are the core audience.